This singing and floating egg-timer will ensure that your eggs are boiled to perfection every time. BeepEgg constantly measures the outer temperature to calculate the core temprature of the egg. Three different tunes sound to signal when the eggs are soft-boiled, medium-boiled, and hard-boiled. Optimized for medium to large sized eggs; add approximately 30-seconds when using extra large eggs Made in Germany; Store BeepEgg with real eggs for best results